austintules2005
09.10.2020 •
Mathematics
Each sandbag holds 27 pounds of sand, and it takes 53 bags to go all the way around Wilma's house. How many pounds of sand does Wilma need to fill the sandbags around her house?
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Ответ:
Ответ:
-75
Step-by-step explanation:
-39 = 24 +(n-1)(-7)
-39 = 24 +7-7n
-39 = 31-7n
7n = 31+39
7n=70
n=10
the sum = 10/2 × (24-39)
= 5 × -15
= -75